- Cable TV Companies & Services, Clarkton
- Candy, Nut & Confectionery Wholesale & Retail, Clarkton - Candy Stores
- Cardiologists, Clarkton - Heart Doctors, Physicians & Surgeons (Cardiology)
- Casual Dining Restaurants, Clarkton
- Caterers Food Services, Clarkton
- Cellular & Mobile Phone Service, Clarkton
- Central American Restaurants, Clarkton
- Child Care & Day Care Services, Clarkton
- Child Related Social Services, Clarkton
- Churches 1 Of 3, Clarkton
- Churches 2 Of 3, Clarkton
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- Churches 3 Of 3, Clarkton
- City & County Government, Clarkton
- Clinics, Clarkton
- College & University Placement Services, Clarkton
- Commercial Printing, Clarkton
- Communications Services, Clarkton
- Community Services, Clarkton
- Construction, Clarkton
- Consultants & Services, Clarkton
- Convenience Stores, Clarkton
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